Allied Telesis AT-FS238a/2 - Manual (Page 32)

Installing the Bridging Converter
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Figure 9 Positive, Ground, and Negative Symbols
Warning
The power input must be provided from SELV source only, per IEC
60950. Do not connect to centralized DC battery bank.
3. Secure the power supply cable in the Restricted Access Area using
multiple cable ties to minimize the chance of the connections being
disturbed by casual contact with the wiring.
Warning
"Safety Hazard"- Check to see if there are any exposed copper strands
coming from the installed wires. When this installation is done correctly
there should be no exposed copper wire strands extending from the
terminal block. Any exposed wiring can conduct harmful levels of
electricity to persons touching the wires.
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4. Plug the power connector to the 12-50VDC receptacle connector in the
rear of the converter, as shown in Figure 10.
Figure 10 Connecting a Power Connector to the 12-50VDC Version Model
DIP S WITCHES
Negative Positive
Ground